Under-reporting
"According to the American Medical Association (1995), sexual violence, and rape in particular, is considered the most under-reported violent crime.[8][9]

The most common reasons given by victims for not reporting rapes are
the belief that it is a personal or private matter, and that they fear reprisal from the assailant. A 2007 British
government report says "Estimates from research suggest that between 75
and 95 percent of rape crimes are never reported to the police."RAINN (Rape, Abuse & Incest National Network) asserts that from 2000 to 2005, 59% of rapes were not reported to law enforcement.[175][176] For college students, the figure was 95% in 2000.[192] One factor relating to this is the misconception that most rapes are committed by strangers.[194]
According to the Bureau of Justice Statistics, 38% of victims were
raped by a friend or acquaintance, 28% by "an intimate" and 7% by
another relative, and 26% were committed by a stranger to the victim.
About four out of ten sexual assaults take place at the victim's own
home.Per UKY.eduThe most recent national study examining the prevalence of

rape in the United States was reported in 2007 and estimated

that 18% of women in this country have been raped in their

lifetime (1). Based on their interviews with a representative

sample of 5,000 women, the researchers in this study

estimated that around 1 million women were raped in 2005,

the year of the study. While that Rape in America report

spotlighted the plight of 1 million women, however, official

data from the Federal Bureau of Investigation indicate that

only about 94,000 rapes were reported to law enforcement in

the same year (2). Together, these data suggest that fewer than 10% of rapes that occur in the United States are ever

reported to police.

When sexual assaults are reported to law enforcement, very

few cases end up being prosecuted, with research indicating

that only 14-18% of all reported sexual assaults ultimately get

prosecuted (3, 4, 5, 6). When limited to rape only (rather

than including all forms of sexual assault), prosecution rates

are slightly higher. The National Violence Against Women

Survey (7) estimated that 37% of reported rapes of adult women were prosecuted.Not all prosecuted cases end in a conviction. The NVAWS

estimated that only 18% of rape cases involving adult women

result in a conviction. So only 10% of rapes in the United States get reported, and of those only 18% lead to a conviction! This is a crime that you can get away with! :( , and "1 million women were raped in 2005" OMG!! That's a lot! Seems like that's no better than medieval times, wonder if we could find those stats!